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ASRock X79 Extreme 4 Rebooting when under stress

Hi all I have a new build computer which when I play games or run a stress test the computer will reboot after 20 minutes (But runs perfectly fine with normal browsing etc). I use furmark for GPU stress testing, I am currently running Memtest86+ to check RAM then I will be using Prime95 to test CPU. So far the only information I can provide is

Please bear in Mind I upgraded from a Intel Corei7 920D, Gigabyte X58-UD3R Using all but the RAM below and didnt have problems

re: ASRock X79 Extreme 4 Rebooting when under stress

Which Prime95 tests were run and for how long?
Have you checked windows Event Viewer to see if there are any problems shortly before each reboot?
Were there any BSOD's just before your system rebooted?
Have you disabled auto reboot when a BSOD happens?
Where are the 200mm fans mounted?
What is the setup for each fan? Intake? Exhaust?
Can you test with another power supply?
Can you temporarily install an internal cooling fan provide better cooling for your video cards?

Repeat your case closed tests with only one video card installed.
If there are no problems, remove the installed video card and test with the other video card.
If there are no errors with both single card tests, underclock both cards by ~10% - 15% to see if this helps.

Re: Asus X79 Extreme 4 Rebooting when under stress

Originally Posted by profJim

Which Prime95 tests were run and for how long?
Have you checked windows Event Viewer to see if there are any problems shortly before each reboot?
Were there any BSOD's just before your system rebooted?
Have you disabled auto reboot when a BSOD happens?
Where are the 200mm fans mounted?
What is the setup for each fan? Intake? Exhaust?
Can you test with another power supply?
Can you temporarily install an internal cooling fan provide better cooling for your video cards?

Repeat your case closed tests with only one video card installed.
If there are no problems, remove the installed video card and test with the other video card.
If there are no errors with both single card tests, underclock both cards by ~10% - 15% to see if this helps.

Many Thanks for your comments. Strange thing it seems to be working now. I moved the GFX card to the top PCI-E slot, I've plugged in the additional X-Fire power to the mainboard and used 2 power rails to power the gfx card instead of 1. I have the sides on the case atm. So far I played 4 games approx 30-40 minutes a session and seems fine.

Answers to the questions

Which Prime95 tests were run and for how long?I just clicked on File then Start and it auto sets all cores and maxes all to 100%Have you checked windows Event Viewer to see if there are any problems shortly before each reboot?All that is shown in the event log is loss of power un scheduled reboot occurredWere there any BSOD's just before your system rebooted?No BSOD. The whole system including the power supply shut down. Then all came back on like a first time boot.Have you disabled auto reboot when a BSOD happens?Not tried this yet. Will set it when I go home tonight.Where are the 200mm fans mounted?I have 1 on the top of the case acting as an exhaust, and 1 at the front of the case as an Intake.What is the setup for each fan? Intake? Exhaust?I have 2 exhaust fans which are 200mm at the top of the case, the 120mm at the very back of the case next to the I/O panel.I have 1 200mm fan at the front as an intake.
I have made my own fan for outside of the case which are 1 120mm with 2x 80mm blowing the air away from the top of the case so no heat builds up.Can you test with another power supply?I dont have a spare at the moment, but it works fine with my old main board.Can you temporarily install an internal cooling fan provide better cooling for your video cards?I dont have any spare fans, but my arctic cooling kit has 3 hi rpm fans working at 100% keeping the GPU at 39'C at idle 77'C at 100% load on both GPUs

Re: ASRock X79 Extreme 4 Rebooting when under stress

It looks like your power supply's OCP (Over Current Protection) kicked in to quickly shut down the psu and system to prevent too much current being used by the limited power delivery system's capacity to your video cards. Your system is probably OK now that you are providing additional needed power via the motherboard power connector.

Re: ASRock X79 Extreme 4 Rebooting when under stress

Originally Posted by Havok316UK

Hi all I have a new build computer which when I play games or run a stress test the computer will reboot after 20 minutes (But runs perfectly fine with normal browsing etc). I use furmark for GPU stress testing, I am currently running Memtest86+ to check RAM then I will be using Prime95 to test CPU. So far the only information I can provide is

Please bear in Mind I upgraded from a Intel Corei7 920D, Gigabyte X58-UD3R Using all but the RAM below and didnt have problems

i was just having this problem with my asrock extreme 6.. i fixed it by putting the SB fan on level 3 speed.. im not sure if you have a south bridge with a fan on the extreme 4 but check in your ASRockAXTU program to see if the SB fan is even on.. if not turn it to whatever level you want.. level 3 is about 2600 rpm.. I hope this helps, it helped me